<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
  <el-header>
    <div>
      <img src="../assets/logo.png" alt="">
      <span> 超市进销管理系统 </span>
    </div>
    <el-button type="info" @click="logout"> 退出 </el-button>
  </el-header>
    <!-- 主体区 -->
  <el-container>
    <!-- 侧边栏 -->
    <el-aside :width="isCollapse ? '64px' : '200px'">
      <div class="toggle-button" @click="toggleCollapse">|||</div>
      <!-- 侧边栏菜单区-->
      <el-menu
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409FFF" :unique-opened="true" :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
      <el-submenu :index="item.ID + ''" v-for="item in menulist" :key="item.ID">
        <!-- 一级菜单 -->
        <template slot="title">
          <!-- 图标 -->
          <i class="el-icon-s-home"></i>
          <!-- 文本 -->
          <span> {{ item.menuname }} </span>
        </template>
        <!-- 二级菜单 -->
        <el-menu-item :index="'/' + item.path" @click="saveNavState('/' + item.path)">
          <template slot="title">
          <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span> {{ item.children }} </span>
        </template>
        </el-menu-item>
         <!-- 二级菜单 -->
        <template>
          <el-menu-item :index="'/' + item.subpath" @click="saveNavState('/' + item.subpath)" v-if="item.subpath !== 'wu'">
            <template slot="title" >
              <i class="el-icon-menu"></i>
              <span> {{ item.subchildren }} </span>
            </template>
          </el-menu-item>
        </template>
      </el-submenu>
    </el-menu>
    </el-aside>
    <!-- 右侧内容主体 -->
    <el-main>
      <!-- 路由占位符 -->
      <router-view>

      </router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menulist: [],
      isCollapse: false,
      // 被激活的链接
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList () {
      const { data: res } = await this.$http.get('/menus')
      if (res.code !== 20000) return this.$message.error(res.msg)
      this.menulist = res.data
    },
    // 点击切换折叠和展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.el-header {
  background-color: #373D41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #EAEDF1;
}
.home-container {
  height: 100%;
}
.toggle-button {
  background-color: #4A5064;
  font-size: 16px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.3em;
  cursor: pointer;
}
</style>
